If I were Emperor of the USA, I would say that if a company sells 50% of their goods in the USA, at least 50% of the goods must be manufactured in the USA. If not, 75% tariff on 100% of goods sold in the USA. Take America back!!!!!!!
You're a very short-sighted Emperor who is ignorant of the inevitable retaliation that occurs when you implement protectionism.
Doing what you suggest, economic protectionism, leads to trade wars and hurts more than it helps. Basically, you'd create a bunch of menial, low-wage jobs in America and take those away from China. Sounds, great, right? Well, sorta great because they are low-quality jobs. But hey, that's better than no jobs, right?
But then China gets pissed about this, because low-wage menial manufacturing jobs are the main thing they are competitive with on the world stage, so they inevitably retaliate. First off they'll switch from buying Boeing planes to buying Airbus planes. Asia and China in particular is one of the largest growth markets for the airline industry, so this is super bad. Boeing has to lay off thousands of people. Congratulations, you've traded high-wage, high-quality American Boeing jobs across several states for low-wage menial manufacturing jobs.
So then the US gets pissed and, I dunno, puts a huge tariff on imported memory chips (something we've actually done in the past), because that also hurts China and it protects US chip manufacturing. But since most memory chips aren't made in the USA, there isn't enough supply so most chips are still imported, just at higher cost, and now all computers, tablets, smart phones, etc. cost an extra $100.
So Japan gets pissed at the chip tariff and counteracts by slapping a tariff on American apples, cherries, and potatoes. Now Washington and Idaho farmers are really hurting too. But good thing you've got those ultra crappy menial jobs assembling iPhones like robots in the USA, jobs that Americans don't even like to take in the first place, which is why immigrants almost always fill the ranks of produce pickers, meat processing plants, and the like.
I could go on and on. This isn't theoretical. This is exactly what happens.
If *I* were Emperor I would encourage American competitiveness for high-wage, high-quality jobs by further supporting education, promising start-ups, high-tech business, and advanced sciences.